Rockford Fosgate T2D215

15" · 4 Ω · 1200 W · 89.7 dB · datasheet ↗

Thiele-Small parameters

Nominal size	15"
Impedance	4 Ω
Fs	31 Hz
Qts	0.523
Qes	0.58
Qms	5.29
Vas	48.4 L
Sd	750 cm²
Xmax	8.7 mm
Re	3.4 Ω
Bl	22.1 T·m
Mms	429.4 g
Pe	1200 W
Sensitivity	89.7 dB

Alignment hint

EBP	53 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 58.5 L

EBP 50-100: works in either a sealed or ported alignment.

Rules of thumb from T/S parameters only. Verify against a real simulation before cutting wood.

Substitute candidates

Driver	Fs (Hz)	Qts	Vas (L)	Xmax (mm)	Sens (dB)	Fit	Notes	Compare
Lanzar OPTI1535D vp	30 -1	0.587 +0.06	55.4 +7	10.4 +1.7	88.3 -1.4	close	8 Ω vs 4 Ω: amp load changes	+
MTX Audio TX815	35 +4	0.508 -0.02	44.7 -3.7	9.6 +0.9	93.3 +3.6	close		+
Rockford Fosgate T2D415	31 =	0.613 +0.09	51.6 +3.2	9.3 +0.6	86.2 -3.5	close	8 Ω vs 4 Ω: amp load changes	+
Peerless STW-350F188PR01-04	26.6 -4.4	0.479 -0.04	58.2 +9.8	10.1 +1.4	89.3 -0.4	usable		+
Ground Zero GZRW 15XSPL D2	34.1 +3.1	0.59 +0.07	63.3 +14.9	11.3 +2.6	91.1 +1.4	usable		+
MTX Audio T612S-22	33.6 +2.6	0.602 +0.08	58.9 +10.5	7.4 -1.3	91.2 +1.5	usable	600 W vs 1200 W: lower power handling · Xmax 7.4 mm < 8.7 mm: lower excursion-limited SPL	+
Orion Audio HCCA 154	30 -1	0.535 +0.01	80 +31.6	12.7 +4	87.9 -1.8	usable	8 Ω vs 4 Ω: amp load changes	+
MTX Audio T815-22	32.3 +1.3	0.635 +0.11	57 +8.6	6.1 -2.6	90 +0.3	usable	600 W vs 1200 W: lower power handling · Xmax 6.1 mm < 8.7 mm: lower excursion-limited SPL	+
Stereo Integrity RM-15 15	29 -2	0.498 -0.03	89.7 +41.3	9.7 +1	89.2 -0.5	usable	8 Ω vs 4 Ω: amp load changes	+
Audiobahn AW150T	30.6 -0.4	0.54 +0.02	95 +46.6	10 +1.3	88.5 -1.2	usable	800 W vs 1200 W: lower power handling	+

Compare the closest 3 against the T2D215 →

Ranked on parameter similarity only (Qts, Fs, Vas, Xmax, sensitivity). Same nominal size required. A hint, not a simulation, model the swap before cutting or buying.

Used in enclosures (0)

No enclosure in the catalog uses this driver yet.